A reverse reversal of fortune.
When a company or, oh, say a TV sitcom (aka Happy Days), begins a downward spiral, the moment that the spiral began they are said to have "
jumped the shark". However, if by intelligence or more likely pure chance, said company or sitcom turns the downward spiral around and all of a sudden they are
in the black or renewed for another season, they have "humped the shark". Okay, what it means is Fonzie
jumped the shark and then turned around and humped the powerful beast and who wouldn't renew a show that had the cojones to do that in the '70s?